RU2514739C2 - Rotary cutting tool - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: rotary reamer (20) comprises, in fact, cylindrical shank (22) with lengthwise axis (A1) and multiple radially displacing and, in fact, axially extending clamp tabs (38) and cylindrical cutting head (24) with central bore (58) and multiple axially extending cutting edges (62) with cutting OD (D). Central bore (58) has multiple spaced in circle and alternating sectors of bores (70) and recess (72) of bores. Note here that every sector (70) of bore has external clamping surface (74) inclined outward to get in clamping contact with internal clamping surface (40) of every clamping tab (38).

EFFECT: adjustment of clamping contact forces and cutting diameter, ease of withdrawal and replacement of cutting head.

13 cl, 11 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a rotary cutting tool for use in metal cutting processes in general and for deployment operations in particular.

State of the art

In the field of rotary cutting tools for deployment operations of metal parts, rotary cutting tools can be performed in many different ways.

US Pat. No. 4,705,435 describes an adjustable reamer with a cutting head integrated in the shank, with outlet channels for cutting fluid directing the cutting fluid to the working edges. The tapered screw conical head that engages inside the threaded shank continues the cutting head.

US Pat. No. 5,163,790 describes an adjustable reamer with an interchangeable cutting head and a coolant supply device supplying a cutting head from external nozzles, having a clamp bolt with a conical head screwed into the reamer shank, securing and extending the cutting head.

US 7,004,692 discloses a reamer having a tool shank, a screw member remaining inside the tool shank during normal operations, and a replaceable cutting head having a fixed cutting diameter. The channels for the cutting fluid inside the screw element direct the cutting fluid to the cutting edges of the cutting head.

An object of the present invention is to provide an improved rotary cutting tool.

Disclosure of invention

In accordance with the present invention, there is provided a rotating cutting tool comprising a tool shank, a cutting head, a locking sleeve, and a clamping nut:

the tool shank comprises a longitudinal axis extending in the front to back direction and has a portion receiving the cutting head adjacent to the surface of the front end of the tool shank and a male threaded portion at the rear of the portion receiving the cutting head;

the cutting head receiving portion comprises a plurality of radially protruding and substantially axially extending clamping tabs, each clamping tab having a male clamping surface inclined outwardly in the forward direction;

the cutting head contains a Central hole with the axis of the Central hole, coaxial with the longitudinal axis, and a peripheral outer surface with many cutting edges, with an outer diameter of cutting axially extending between the surface of the rear end of the cutting head and the surface of the front end of the cutting head,

the central hole comprises a plurality of substantially axially extending hole sectors, each hole sector having a female clamping surface inclined outwardly toward the surface of the front end of the cutting head;

the locking sleeve has a cylindrical shape with a through hole between the surface of the rear end of the locking sleeve and the surface of the front end of the locking sleeve; but

the clamping nut has a threaded hole between the front and rear surfaces of the clamping nut;

the threaded hole of the clamping nut is threadedly engaged with the male threaded portion of the tool shank, while the surface of the rear end of the locking sleeve is in contact with the surface of the front end of the clamping nut, the surface of the front end of the locking sleeve is in contact with the surface of the rear end of the cutting head wherein the plurality of female clamping surfaces are in clamping contact with the plurality of female clamping surfaces,

wherein the clamping contact forces and the cutting diameter can be increased and reduced by adjusting the rotational position of the clamping nut, the cutting head can be removed and replaced by subsequent rotation of the clamping nut without removing the locking sleeve or clamping nut from the tool shank.

Brief Description of the Drawings

For a better understanding, the invention will be described below only by way of example with reference to the accompanying drawings, in which dashed lines represent cut-out borders for partial views of an element, and in which:

Figure 1 is a perspective view of a rotating cutting tool in accordance with the present invention;

Figure 2 is a perspective view of a rotating cutting tool with a spatial exploded elements shown in figure 1;

Figure 3 is a longitudinal side view of the tool shank in accordance with the present invention;

Figure 4 is a view of the front end of the tool shank shown in figure 3;

Figure 5 is a view of the front end of the cutting head in accordance with the present invention;

FIG. 6 is a sectional view taken along line VI-VI of the cutting head shown in FIG. 5;

Fig.7 is a view of the front end of the locking sleeve in accordance with the present invention;

Fig. 8 is a sectional view taken along line VIII-VIII of the locking sleeve shown in Fig. 7;

Fig.9 is a longitudinal side view in section of a rotating cutting tool shown in Fig.1;

Figure 10 is a sectional view along the line X-X of the rotary cutting tool shown in figure 9; and

11 is a view of the front end of the rotary cutting tool shown in FIG. 9.

DETAILED DESCRIPTION OF THE INVENTION

1 and 2 show a rotary cutting tool 20 in accordance with the present invention. The rotary cutting tool 20 is in the form of a sliding reamer including a tool shank 22, a cutting head 24, a locking sleeve 26 and a clamping nut 28. Typically, the tool shank 22, the locking sleeve 26 and the clamping nut 28 are made of machined steel, while the cutting head 24 of the present invention can be accomplished by pressing and sintering a carbide powder such as tungsten carbide.

The tool shank 22, as shown in FIGS. 3 and 4, is generally cylindrical with a longitudinal axis A1 extending in the front direction F, R from front to back, with a cutting head receiving portion 30 near the surface 32 of the front end of the tool shank and the male threaded portion 34 behind the cutting head receiving portion 30.

The cutting head receiving portion 30 has six substantially flat receiving surfaces 36 of the cutting head, uniformly spaced circumferentially around the longitudinal axis A1, alternating with six radially protruding and essentially axially extending clamping tabs 38, uniformly spaced around the circumference around the longitudinal axis A1, wherein an imaginary circle C, described in a plane perpendicular to the longitudinal axis A1, through twelve lines of intersection between the six receiving surfaces 36 of the cutting head and six clamping petals 38, has a first radius R1 of the receiving surface. In some embodiments, the six receiving surfaces 36 of the cutting head may be parallel to the longitudinal axis A1. Each clamping flange 38 has a male clamping surface 40 inclined outwardly in the F direction forward, intersecting a partially cylindrical outer flap surface 42 of the flange adjacent to the surface 32 of the front end of the shank with a second radius of the clamping flange R2. The male clamping surface 40 forms a sharp inner first inclination angle δ1 with the longitudinal axis A1.

It should be understood that in the entire detailed description and in the claims, the "internal angle" refers to the angle between the two elements measured inside, and the "external angle" refers to the angle between the two elements measured outside.

The six clamping petals 38 have a first inclination angle α1 in the longitudinal direction of the clamping petal of 60 °, with each clamping petal 38 including circumferential front and rear surfaces 44, 46 of the petal transverse to the adjacent outer surface 42 of the petal having a first angular length E1 of the clamping lobe between the first edge 45 of the lobe and the second edge 47 of the lobe. The first edge 45 of the petal is formed at the intersection of the front surface 44 of the petal and the outer surface 42 of the petal, while the second edge 47 of the petal is formed at the intersection of the rear surface 46 of the petal and the outer surface 42 of the petal. The terms “front surfaces” and “rear surfaces” are used to indicate counter-clockwise rotation of the tool shank 22 during operation of the rotary cutting tool 20 when viewed in the direction of the surface 32 of the front end of the tool shank.

For other embodiments of the present invention, “front surfaces” and “rear surfaces” can be reversed to indicate the rotation of the tool shank 22 clockwise during operation of the rotary cutting tool 20 when viewed in the direction of the surface 32 of the front end of the tool shank, for these embodiments of the present invention, the direction of rotation of the other elements of the rotary cutting tool 20 is accordingly reversed.

The male threaded portion 34 at the rear of the cutting head receiving portion 30 extends in the F direction forward from the main annular surface 48 and includes three axially extending locking protrusions 50 extending further in the forward direction F, each locking protrusion 50 having a front surface 52 of the locking protrusion. Three locking protrusions 50 are evenly spaced circumferentially with a second angle of inclination α2 in the longitudinal direction of the locking protrusion equal to 120 °, and each locking protrusion 50 includes radially extending and limiting the circumference of the first and second surfaces 54, 56 of the locking protrusion having a second angular the length E2 of the locking protrusion.

The cutting head 24, as shown in FIGS. 5 and 6, has a central hole 58 and a peripheral outer surface 60 including six cutting edges 62 extending axially between the rear end surface 64 of the cutting head and the front end surface 66 of the cutting head with an outer diameter D cutting. Each cutting edge 62 has an adjacent front surface 68 transverse to the peripheral outer surface 60 and substantially facing counterclockwise when viewed in the direction of the front surface 66 of the cutting head.

The Central hole 58 has six uniformly spaced around the circumference and essentially axially extending hole sectors 70, alternating with six equally spaced around the circumference of the axially extending hole recesses 72, the hole sectors 70 and the recessed holes 72 having a third inclination angle α3 in the longitudinal direction of the hole recess, equal to the first inclination angle α1 in the longitudinal direction of the clamping tab; 60 °. Each hole sector 70 has an enclosing clamping surface 74 inclined outwardly toward the front end surface 66 of the cutting head, intersecting an axially extending hole sector surface 76, adjacent to the rear end surface of the cutting head 64 with a third hole sector radius R3. The female clamping surface 74 forms a sharp external second angle δ2 of inclination with the axis A2 of the Central hole. Each hole recess 72 includes circumferential first and second recess surfaces 78, 80 of the recess, transverse to the adjacent surface 76 of the recess sector, having a third angular recess length E3 between the first recess edge 79 and the second recess edge 81. The first edge 79 of the recess of the hole is formed at the intersection of the first surface 78 of the recess of the hole and its adjacent surface 76 of the hole sector, and the second edge 81 of the recess of the hole is formed at the intersection of the second surface 80 of the recess of the hole and its own adjacent surface 76 of the hole sector.

The clamping nut 28, as shown in FIGS. 2 and 9, has a cylindrical shape with a threaded hole 82 between the front end surface of the clamping nut 84a and the rear end surface 84b of the clamping nut, and the clamping nut 28 has mirror symmetry with respect to the central plane P, perpendicular to axis A3 threaded holes.

The locking sleeve 26, as shown in FIGS. 7 and 8, has a cylindrical shape with a through hole 86 between the rear end surface 88 of the clamping sleeve and the front end surface 90 of the locking sleeve. The surface 90 of the front end of the locking sleeve has six uniformly spaced circumferentially and axially extending centering protrusions 92 with a fourth inclination angle α4 in the longitudinal direction of the centering protrusion equal to the first inclination angle α1 in the longitudinal direction of the clamping tab; 60 °, the surface 88 of the rear end of the locking sleeve has three evenly spaced circumferentially and axially extending grooves 94 with a fifth angle of inclination α5 in the longitudinal direction of the locking groove equal to the second angle of inclination α2 in the longitudinal direction of the locking protrusion; 120 °.

Each centering protrusion 92 includes circumferentially extending first and second surfaces 96 of the centering protrusion transverse to the adjacent surface 87 of the through hole having a fourth angular length E4 of the centering protrusion between the first edge 97 of the centering protrusion and the second edge 99 of the centering protrusion. The first edge 97 of the centering protrusion is formed at the intersection of the first surface 96 of the centering protrusion and the through hole surface 87, and the second edge 99 of the centering protrusion 99 is formed at the intersection of the second surface 98 of the centering protrusion and the through hole surface 87.

Each locking groove 94 includes circumferentially limiting and radially extending first and second locking groove surfaces 100, 102 having a fifth angular length E5 of the locking groove. Each locking groove 94 also includes a rear surface 104 of the locking groove perpendicular to the axis A4 of the through hole.

Figure 9-11 shows a rotating cutting tool 20, while the initial assembly is carried out in the following four stages:

At the first stage of assembly, the clamping nut 28 is located next to the surface 32 of the front end of the shank of the cutting tool, while the axis A3 of the threaded hole is approximately coaxial with the longitudinal axis A1. Then, the tool shank 22 is inserted into the threaded hole 82 of the clamping nut 28 until the male threaded portion 34 engages with the threaded hole 82, while the clamping nut 28 is turned counterclockwise when viewed from the front surface 32 of the shank tool until surface 84b of the rear end of the clamping nut comes into contact with the annular surface 48 of the base.

In the second assembly step, the rear end surface 88 of the locking sleeve is positioned adjacent to the front end surface 32 of the tool shank, the axis A4 of the through hole being approximately coaxial with the longitudinal axis A1. Then, the tool shank 22 is inserted into the through hole 86 of the locking sleeve 26 until the three locking protrusions 50 of the tool shaft 22 engage with the three locking grooves 94 of the locking sleeve 26 and each front surface 52 of the locking ledge comes into contact with each rear surface 104 of the locking groove. Then, the locking sleeve 26 is rotated counterclockwise when viewed from the surface 32 of the front end of the tool shank until the first three surfaces 100 of the locking groove come into contact with the three first surfaces 54 of the locking protrusions and the six centering protrusions 92 of the locking sleeve 26 will not be aligned with six clamping tabs 38 of the tool shank 22.

At the third stage of assembly, the surface 64 of the rear end of the cutting head is initially located near the surface 32 of the front end of the tool shank, while the axis A2 of the central hole is approximately coaxial with the longitudinal axis A1, while the cutting head 24 is oriented by rotation until the six recesses 72 of the hole are aligned around a circle with six clamping petals 38. Then the tool shank 22 is inserted into the central hole 58 of the cutting head 24 until six centering protrusions 92 of the locking sleeve 26 are in will engage with six recesses 72 of the hole of the cutting head 24, and the surface 64 of the rear end of the cutting head will not come into contact with the surface 90 of the front end of the locking sleeve, while six surfaces 76 of the sectors of the opening of six sectors 70 of the opening of the cutting head 24 are located behind the receiving cutting head section 30 of the tool shank 22. Then the locking sleeve 26 and the cutting head 24 are simultaneously rotated in a clockwise direction when viewed from the side of the surface 32 of the front end of the tool shank and, until the three second surfaces 102 of the locking groove of the locking sleeve 26 abut against the three second surfaces 56 of the locking protrusions of the tool shank 22 and the six sectors 70 of the opening of the cutting head 24 are aligned with the six clamping petals 38 of the tool shank 22.

It should be understood that in the third assembly step, in order to insert the tool shank 22 into the central hole 58 of the cutting head 24 and engage six centering protrusions 92 with six hole recesses 72, the third angular length E3 of the recess of the hole must be greater than the first angular length E1 of the clamping tab (E3> E1), and also greater than the fourth angular length E4 of the centering protrusion (E3> E4), while the third radius R3 of the hole sector should be larger than the first radius R1 of the receiving surface (R3> R1).

It should also be understood that during the third assembly step, the angle of rotation of the locking sleeve 26 from a position in which the three first surfaces 100 of the locking groove are in contact with the three first surfaces 54 of the locking protrusions to a position in which the three second surfaces 102 of the locking groove are in contact with the three second surfaces 56 of the locking protrusion, is equal to the difference in the angular length between the fifth angular length E5 of the locking groove and the second angular length E2 of the locking protrusion; E5-E2, while simultaneously turning the cutting head 24 from a position in which six recesses 72 of the holes are aligned with six clamping tabs 38 to a position in which six sectors of the holes 70 are aligned with six clamping tabs 38, is half the first tilt angle α1 in the longitudinal direction of the clamping tab; α1 / 2, where E5-E2 is equal to α1 / 2 and has a value of 30 °.

In the fourth assembly step, the clamping nut 28 is rotated clockwise when viewed from the side of the surface 32 of the front end of the tool shank, until the front end surface 84a of the clamping nut comes into contact with the surface 88 of the rear end of the locking sleeve, the surface 90 of the front end of the locking the sleeve is in clamping contact with the surface 64 of the rear end of the cutting head, while the female clamping surfaces 74 of the six hole sectors 70 are in clamping contact with the male and clamping surfaces 40 of six clamping tabs 38. The acute inner first inclination angle δ1 of the male clamping surfaces 40 with the longitudinal axis A1 is equal to the acute outer second inclination angle δ2 of the inclining clamping surfaces 74 with the axis A2 of the central hole, with a manufacturing tolerance of 1 °.

It should be understood that in the fourth assembly step, in order to achieve clamping contact between the female clamping surfaces 74 of the six hole sectors 70 and the female clamping surfaces 40 of the six clamping tabs 38, the third radius of the opening sector R3 must be less than the second radius of the clamping tab R2 ( R3 <R2).

The rotary cutting tool 20 of the present invention may have a cutting head 24 configured so that the cutting diameter D can be adjusted by increasing or decreasing the radial constituents of the clamping forces between the female clamping surfaces 74 of the six hole sectors 70 and the female clamping surfaces 40 of the six clamping tabs 38 and Thus, it can be called a sliding sweep. Turning the clamping nut 28 in a clockwise direction when viewed from the surface 32 of the front end of the tool shank increases the radial clamping forces and cutting diameter D, while turning the clamping nut 28 in a counterclockwise direction when viewed from the side of the front end 32 tool shank, reduces radial clamping forces and cutting diameter D.

The rotary cutting tool 20 of the present invention may also be configured to direct the cooling fluid to each of the six cutting edges 62 by making six holes 106 with a smaller diameter for the coolant in the receiving portion of the cutting head portion 30 of the tool shank 22, each hole 106 of a smaller diameter extends in a radial direction from the hole for the coolant 108 of a larger diameter, coaxial with the longitudinal axis A1, to the outer surface 42 of the petals each of the clamping tab 38.

It should be understood that the four assembly steps described above are required only for the initial assembly of the rotary cutting tool 20, and after the initial assembly, the clamping nut 28 and the locking sleeve 26 do not need to be removed when removing and replacing the cutting head 24.

The removal and replacement of the cutting head 24, accompanying the normal operation of the rotating cutting tool 20, is carried out in the following steps:

In the first step of replacing the cutting head, the clamping nut 28 is turned counterclockwise when viewed from the front surface 32 of the tool shank until the surface 84b of the rear end of the clamping nut comes into contact with the annular surface of the base 48.

In the second stage of replacing the cutting head, the locking sleeve 26 and the cutting head are simultaneously rotated counterclockwise when viewed from the surface 32 of the front end of the tool shank until the first three surfaces 100 of the locking groove come into contact with the three first surfaces 54 the locking protrusion and the six recesses 72 of the hole will not be aligned with six clamping tabs, after which the cutting head 24 can be removed.

The third and fourth stages of the change of the cutting head are a repeat of the third and fourth stages of assembly described above for the initial assembly of the rotary cutting tool 20.

Although the present invention has been described with some degree of specificity, it should be understood that various changes and additions can be made to it, without going beyond the scope defined by the appended claims.

Claims (13)

1. A rotating cutting tool (20) comprising a tool shank (22), a cutting head (24), a locking sleeve (26) and a clamping nut (28), wherein
the tool shank (22) contains a longitudinal axis (A1), extending in the direction (F, R) from front to back, and has a receiving head section (30) near the surface (32) of the front end of the tool shank and a male threaded section (34) at the back receiving the cutting head section (30);
the cutting head receiving portion (30) comprises a plurality of radially protruding and substantially axially extending clamping tabs (38), each clamping tab having a male clamping surface (40), tilted outward in the direction (F) forward, and a male threaded section (34) , including many axially extending retaining protrusions (50);
the cutting head (24) contains a Central hole (58) having an axis (A2) of the Central hole, coaxial with the longitudinal axis (A1), and a peripheral outer surface (60) with many cutting edges (62), with an outer diameter (D) cutting extending axially between the surface (64) of the rear end of the cutting head and the surface (66) of the front end of the cutting head,
the central hole (58) comprises a plurality of substantially axially extending hole sectors (70) and a plurality of axially extending hole recesses (72), with each hole sector (70) having a female clamping surface (74) tilted outward towards the surface (66 ) the front end of the cutting head;
the locking sleeve (26) has a cylindrical shape with a through hole (86) between the surface (88) of the rear end of the locking sleeve and the surface (90) of the front end of the locking sleeve, while the surface (90) of the front end of the locking sleeve has many centering protrusions (92) and the surface (88) of the rear end of the locking sleeve has a plurality of locking grooves (94);
the clamping nut (28) has a threaded hole (82) between the surface (84a, 84b) of the front and rear ends of the clamping nut;
wherein the threaded hole (82) of the clamping nut (28) is threadedly engaged with the male threaded portion (34) of the tool shank (22), the surface (88) of the rear end of the locking sleeve being in contact with the surface (84a) of the front end of the clamping nuts, the front end surface of the locking sleeve is in contact with the surface (64) of the rear end of the cutting head, and the plurality of female clamping surfaces (74) are in contact with the plurality of male clamping surfaces ( 40)
the clamping contact forces and the cutting diameter D can be increased and decreased by adjusting the rotational position of the clamping nut (28), and the cutting head (24) can be removed and replaced by subsequent rotation of the clamping nut (28) without removing the locking sleeve (26) or clamping nuts (28) from the tool shank (22),
however, a plurality of locking protrusions (50) are engaged with a plurality of locking grooves (94), and a plurality of centering protrusions (92) are engaged with a plurality of recesses (72) of the hole. 2. A rotary cutting tool (20) according to claim 1, wherein the plurality of clamping tabs (38), the plurality of recesses (72) of the hole and the plurality of centering protrusions (92) are uniformly spaced around the circumference and have a first inclination angle α1 in the longitudinal direction of the clamping tab a third inclination angle α3 in the longitudinal direction of the recess of the hole and a fourth inclination angle α4 in the longitudinal direction of the centering protrusion, respectively,
wherein the first tilt angle α1 in the longitudinal direction, the third tilt angle α3 in the longitudinal direction and the fourth tilt angle α4 in the longitudinal direction are equal. 3. A rotating cutting tool (20) according to claim 2, wherein the plurality of locking protrusions (50) and locking grooves (94) are uniformly spaced around the circumference and have a second inclination angle α2 in the longitudinal direction of the locking protrusion and a fifth inclination angle α5 in the longitudinal direction locking groove respectively
wherein the second tilt angle α2 in the longitudinal direction and the fifth tilt angle α5 in the longitudinal direction are equal. 4. A rotating cutting tool (20) according to claim 2, in which
each of the plurality of locking grooves (94) contains circumferentially limiting and radially extending first and second surfaces (100, 102) of the locking groove having a fifth angular length E5 of the locking groove, and
each of the plurality of locking protrusions (50) comprises circumferentially limiting and radially extending first and second surfaces (54, 56) of the locking protrusion having a second angular length E2 of the locking protrusion, wherein
the fifth angular length E5 is greater than the second angular length E2, wherein the difference in angular length between the second angular length E2 and the fifth angular length E5, E5-E2 is equal to half the first inclination angle α1 in the longitudinal direction; α1 / 2. 5. A rotary cutting tool (20) according to claim 3, which contains six clamping tabs (38), six recesses (72) holes and six centering protrusions (92) having a first angle α1 of inclination in the longitudinal direction, a third angle α3 of inclination in the longitudinal direction and the fourth angle α4 of inclination in the longitudinal direction, respectively, equal to 60 °,
and contains three locking protrusions (50) and three locking grooves (94) having a second angle of inclination α2 in the longitudinal direction and a fifth angle of inclination α5 in the longitudinal direction, respectively, equal to 120 °. 6. The rotary cutting tool (20) according to claim 1, in which
each of the plurality of clamping tabs (38) includes a partially cylindrical, continuing outer surface (42) of the tab, adjacent to the surface (32) of the front end of the tool shank having a second radius of the clamping tab R2, and
each of the plurality of hole sectors (70) includes an axially extending hole sector surface (76), an adjacent surface (64) of the rear end of the cutting head having a third hole sector radius R3,
the second radius R2 is greater than the third radius R3. 7. A rotary cutting tool (20) according to claim 6, in which
the cutting head receiving portion (30) has a plurality of substantially flat receiving surfaces (36) of the cutting head, uniformly spaced around a circumference around the longitudinal axis (A1), alternating with a plurality of clamping tabs (38), wherein
the imaginary circle (C) described through the intersection lines between the plurality of receiving surfaces (36) of the cutting head and the plurality of clamping petals (38) has a first radius R1 of the receiving surface,
the third radius R3 is larger than the first radius R1. 8. A rotary cutting tool (20) according to claim 6, in which
each of the plurality of recesses (72) of the opening contains circumferential first and second surfaces (78, 80) of the opening of the opening transverse to the adjacent surface (76) of the opening sector and having a third angular length E3 of the opening of the opening,
each of the plurality of clamping petals (38) comprises circumferential front and rear surfaces (44, 46) of the petal transverse to the adjacent outer surface (42) of the petal and having a first angular length E1 of the clamping petal, and
each of the plurality of centering protrusions (92) contains the first and second surfaces (96, 98) of the centering protruding around the circumference, transverse to the adjacent surface (86) of the through hole and having a fourth angular length E4 of the centering protrusion,
wherein the third angular length E3 is greater than the first angular length E1, and the third angular length E3 is greater than the fourth angular length E4. 9. A rotating cutting tool (20) according to claim 6, in which the hole (106) of a smaller diameter for the cutting fluid extends radially from the hole (108) of a larger diameter for the cutting fluid coaxial with the longitudinal axis (A1) to the outer surface (42) of the petal of each clamping petal (38). 10. The rotary cutting tool (20) according to claim 1, wherein the acute inner first inclination angle δ1 formed between the plurality of male clamping surfaces (40) and the longitudinal axis (A1) is substantially equal to the acute outer second inclination angle δ2 formed between a plurality of female gripping surfaces (74) and an axis (A2) of the central hole. 11. A rotary cutting tool (20) according to claim 1, wherein the rotary cutting tool (20) is a sliding reamer. 12. A rotating cutting tool (20) according to claim 1, wherein the cutting head (24) is made of sintered carbide. 13. The method of assembly of a rotating cutting tool (20) according to claim 1, including
the location of the threaded hole (82) of the clamping nut (28) coaxially with the longitudinal axis (A1) before engaging the male threaded portion (34) of the tool shank (22) with the threaded hole (82) and turning the clamping nut (28) counterclockwise arrows when viewed from the side of the surface (32) of the front end of the tool shank,
the location of the through hole (86) of the locking sleeve (26) coaxially with the longitudinal axis (A1) before engaging a plurality of locking tabs (50) with a plurality of locking grooves (94) and turning the locking sleeve (26) counterclockwise when viewed from the side of the surface (32) of the front end of the tool shank, until the many centering protrusions (92) are aligned in a circle with the set of clamping tabs (38),
the location of the Central hole (58) of the cutting head (24) coaxially with the longitudinal axis (A1) before engaging the set of recesses (72) holes with many clamping tabs (38) and many centering protrusions (92) and the rotation of the cutting head (24) in clockwise direction, when viewed from the side of the surface (32) of the front end of the tool shank, until the plurality of sectors (70) of the hole align with the plurality of clamping tabs (38),
and turning the clamping nut (28) in a clockwise direction, as viewed from the surface (32) of the front end of the tool shank, until the clamping contact is made between:
the surface (84a) of the front end of the clamping nut and the surface (88) of the rear end of the locking sleeve,
the surface (90) of the front end of the locking sleeve and the surface (64) of the rear end of the cutting head, and
a plurality of female gripping surfaces (74) and a plurality of female gripping surfaces (40).

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